Introduction
Applications
Features
Specifications
Ordering Information
Introduction 
The PCL-720 Digital I/O and Counter Card is a PC compatible add-on card with 32 digital input channels, 32 digital output channels and three programmable counter/timer channels.
Its digital I/O channels are TTL-compatible and use 74LS244 driver/buffer circuits to provide higher driving capacity for outputs. These buffered circuits also require lower loading current for input than the regular TTL circuits.
The PCL-720's Intel 8253 programmable timer/counter provides three flexible 16-bit timer/counter channels. You can generate waves and pulses by programming the 8253. Jumper settings determine clock crystal frequency. The PCL-720 also includes a breadboard area perfect for customized circuits.
Applications
- Digital input
Contact-closure monitor
Switch-panel status sensor BCD interface receiver
Digital signal interface
- Digital output
Industrial ON/OFF controller
Digital signal interface
BCD interface driver
- Counter/timer
Period and pulse-width measurement
Event and frequency counting
Waveform and pulse generation
Features
- 32 TTL digital input channels 3
- 2 TTL digital output channels
- High output driving capacity
- Low input loading
- Three programmable counter/timer channels
- User configurable clock source
- Breadboard area for custom circuits
Specifications
Digital input
- Logic level 0: 0.8 V max
- Logic level 1: 2.0 V min.
Digital output
- Logic level 0: 0.5 V max. @ 24 mA (sink)
- Logic level 1: 2.0 V min. @ 15 mA (source)
Programmable counter/timer
- Frequency range: 0 to 2.6 MHz
- Counters: Three independent 16-bit counters
- Modes: Six programmable modes
- Usable pins: CLOCK and GATE for each channel
Clock Source
- Clock frequency: 2 MHz, 1 MHz, 500 KHz or 250 KHz; jumper selectable
- Frequency divider: divided by 1, 10, 100 or user adjustable
General
- Transfer rate: 300 Kbps typical, 500 Kbps max.
- Power consumption: 5 V @ 500 mA typical
- Dimensions: 8" x 3/4" (205mm x 95 mm)
- I/O port address: Eight consecutive bytes from hex 200 to hex 3F8
- Breadboard area: 651 (31 x 21) plated-through "donuts", each with a .036" hole on .10" centers
Ordering Information
- PCL-720
Digital I/O and Counter Card, user's manual
- PCLD-780
Screw Terminal Board
- PCLD-782B
24/16 Channel Opto-isolated D/I Board
- PCLD-785B
24/16 Channel Relay Output Board
-
- PCLD-786
SSR and Relay Driver Board
- PCLK-1050
Industrial Wiring Kit
- PCLS-DLL-DIO $FREE
Window 3.1 DLL Driver |
